bugfix: fix regression bug in ebt_ip6 which resulted in ebtables IPv6 src/dst fields not being zeroed

[Luis Fernando Cornachioni Estrozi <lestrozi@uolinc.com>]

fix regression bug in ebt_ip6 which resulted in ebtables IPv6 src/dst
fields not being zeroed

Signed-off-by: Luís Fernando Cornachioni Estrozi <lestrozi@uolinc.com>
---
this bug was introduced on commit
0898f99a267f89a7dc72cc687955f17613a711b8 on Mar 08, 2010; I'm just
returning 2 checks that existed before as suggested by Bart De Schuymer

--- linux-3.8.13/net/bridge/netfilter/ebt_ip6.c.orig    2013-07-03
12:07:25.892466692 -0300
+++ linux-3.8.13/net/bridge/netfilter/ebt_ip6.c    2013-07-03
12:29:47.272496246 -0300
@@ -48,10 +48,12 @@ ebt_ip6_mt(const struct sk_buff *skb, st
      if (info->bitmask & EBT_IP6_TCLASS &&
         FWINV(info->tclass != ipv6_get_dsfield(ih6), EBT_IP6_TCLASS))
          return false;
-    if (FWINV(ipv6_masked_addr_cmp(&ih6->saddr, &info->smsk,
-                       &info->saddr), EBT_IP6_SOURCE) ||
-        FWINV(ipv6_masked_addr_cmp(&ih6->daddr, &info->dmsk,
-                       &info->daddr), EBT_IP6_DEST))
+    if ((info->bitmask & EBT_IP6_SOURCE &&
+            FWINV(ipv6_masked_addr_cmp(&ih6->saddr, &info->smsk,
+                    &info->saddr), EBT_IP6_SOURCE)) ||
+            (info->bitmask & EBT_IP6_DEST &&
+            FWINV(ipv6_masked_addr_cmp(&ih6->daddr, &info->dmsk,
+                    &info->daddr), EBT_IP6_DEST)))
          return false;
      if (info->bitmask & EBT_IP6_PROTO) {
          uint8_t nexthdr = ih6->nexthdr;

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